Symptom: Excessive black smoke at full load. (Hot, unburned fuel)

• Dirty primary or secondary air cleaner.
• Overloading.
• Overfueling.
• Operating in a gear that is too high.
• Faulty turbocharger.

Symptom: Blue smoke (indicates oil consumption)

• Leaking head gasket.
• Cracked head and/or liners.
• Faulty injector.
• Incorrect starting procedure.
• In correct fuel injection timing.
• Poor fuel quality.

Symptom: Increased oil consumption/ excess blow-by

• High hours on engine.
• Worn rings and/or liners.
• Worn turbocharger seals.
• Worn valve guides.

Symptom: Unusual noises

• Malfunctioning fuel nozzles and/or injectors.
• Worn piston pin bushings.
• Worn rod and/or main bearings.
• Malfunctioning turbocharger.
• Too much valve lash.

Symptom: Lack of power

• Dirty air cleaner.
• Dirty fuel filter.
• Incorrect governor linkage adjustment.
• Malfunctioning fuel nozzles and/or injectors.
• Slipping torque converter.
• Improper set point.
• Poor fuel quality
• Increased fuel consumption
• Fuel leak.
• Dirty air cleaner.
• Incorrect governor linkage adjustment.
• Malfunctioning fuel nozzles and/or injectors.
• Improper set point.
• Poor fuel quality.

Symptom: Oil level overfill

• Coolant and/or fuel leak into crankcase.
• Improper oil fill.

Symptom: Debris in oil filter

• Dirt entry.
• Damaged bearings.
• Coolant and/or fuel leak into crankcase.
• Excessively long oil drain interval.
• Incorrect oil used.

Catching problems in their early stage can help prevent a costly major overhaul.
If you pay for a major engine overhaul, it is almost impossible to reap the
value of a construction or other machine before another major component needs
major repair.